{"id":123408,"date":"2025-04-04T15:05:07","date_gmt":"2025-04-04T13:05:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnovlenie-xz-utils-5-8-1-s-ustraneniem-uyazvimosti"},"modified":"2025-04-04T15:05:07","modified_gmt":"2025-04-04T13:05:07","slug":"obnovlenie-xz-utils-5-8-1-s-ustraneniem-uyazvimosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/obnovlenie-xz-utils-5-8-1-s-ustraneniem-uyazvimosti","title":{"rendered":"Aktualizace XZ Utils 5.8.1 s opravou zranitelnosti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Byla vyd\u00e1na verze XZ Utils 5.8.1, kter\u00e1 zahrnuje knihovnu liblzma a utility pro pr\u00e1ci se zkomprimovan\u00fdmi daty ve form\u00e1tu . XZ Utils 5.8.1 se stal prvn\u00edm v\u00fdznamn\u00fdm vyd\u00e1n\u00edm po incidentu s odhalen\u00edm backdooru, kter\u00fd poskytoval p\u0159\u00edstup p\u0159es sshd. Minul\u00fd t\u00fdden byl v Gitu vytvo\u0159en tag 5.8.0, ale vyd\u00e1n\u00ed nebylo ofici\u00e1ln\u011b ozn\u00e1meno kv\u016fli zji\u0161t\u011bn\u00fdm probl\u00e9m\u016fm s v\u00fdkonnost\u00ed a kompatibilitou se star\u0161\u00edmi verzemi GNU make.    <\/p>\n<p>Ve vyd\u00e1n\u00ed XZ Utils 5.8.1 byla odstran\u011bna zranitelnost (CVE-2025-31115), kter\u00e1 zp\u016fsobovala hav\u00e1rii p\u0159i pokusu o rozbalen\u00ed speci\u00e1ln\u011b vytvo\u0159en\u00fdch archiv\u016f. Zranitelnost byla zp\u016fsobena p\u0159\u00edstupem k ji\u017e uvoln\u011bn\u00e9 oblasti pam\u011bti (use after free). \u00dato\u010dn\u00edk m\u016f\u017ee dos\u00e1hnout z\u00e1pisu sv\u00e9 hodnoty na adresu, kter\u00e1 se po\u010d\u00edt\u00e1 jako . Probl\u00e9m je pova\u017eov\u00e1n za ne\u00famyslnou chybu, proto\u017ee zm\u011bna, kter\u00e1 jej zp\u016fsobila, byla do k\u00f3du zavedena dlouho p\u0159ed p\u0159\u00edchodem v\u00fdvoj\u00e1\u0159e Jia Tan, jeho\u017e \u010dinnost vedla k implementaci backdooru.      <\/p>\n<p>Probl\u00e9m se projevuje od vyd\u00e1n\u00ed XZ Utils 5.3.3alpha p\u0159i dek\u00f3dov\u00e1n\u00ed v multithreadov\u00e9m re\u017eimu (jednovl\u00e1knov\u00fd dekod\u00e9r probl\u00e9m neovliv\u0148uje). Krom\u011b standardn\u00edch utilit z bal\u00ed\u010dku xz se zranitelnost projevuje tak\u00e9 v t\u0159et\u00edch aplikac\u00edch, kter\u00e9 pou\u017e\u00edvaj\u00ed funkci lzma_stream_decoder_mt z knihovny liblzma. Zranitelnost byla odstran\u011bna ve vyd\u00e1n\u00ed XZ Utils 5.8.1 a tak\u00e9 byla p\u0159enesena do stabiln\u00edch v\u011btv\u00ed 5.4 a 5.6. Sledovat aktualizace v distribuc\u00edch lze na n\u00e1sleduj\u00edc\u00edch str\u00e1nk\u00e1ch: Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, Arch, FreeBSD. Jako obch\u00e1zec\u00ed ochranu lze zak\u00e1zat dek\u00f3dov\u00e1n\u00ed soubor\u016f v multithreadov\u00e9m re\u017eimu pou\u017eit\u00edm p\u0159i spu\u0161t\u011bn\u00ed xz mo\u017enost\u00ed  nebo aplikov\u00e1n\u00edm utility xzdec.    <\/p>\n<p>Mezi funk\u010dn\u00edmi zm\u011bnami ve v\u011btvi XZ Utils 5.8 lze poznamenat:  <\/p>\n<ul>\n<li class=\"l\"> Do dekod\u00e9ru LZMA\/LZMA2 byla p\u0159id\u00e1na mo\u017enost pou\u017e\u00edvat instrukce SSE2 m\u00edsto funkce memcpy() na 32- a 64-bitov\u00fdch syst\u00e9mech x86. Tato zm\u011bna umo\u017enila zkr\u00e1tit \u010das dek\u00f3dov\u00e1n\u00ed a\u017e o 5 % p\u0159i sestaven\u00ed s Glibc a a\u017e o 15 % p\u0159i sestaven\u00ed s musl p\u0159i rozbalov\u00e1n\u00ed soubor\u016f s velmi vysokou \u00farovn\u00ed komprese.\n<li class=\"l\"> Ve liblzma byla zv\u00fd\u0161ena rychlost k\u00f3dov\u00e1n\u00ed na 64-bitov\u00fdch syst\u00e9mech PowerPC a RISC-V.\n<li class=\"l\"> Do lzma\/bcj.h byl p\u0159id\u00e1n n\u00edzko\u00farov\u0148ov\u00fd API BCJ filtr\u016f (Branch\/Call\/Jump) pro syst\u00e9my RISC-V, ARM64 a x86.\n<li class=\"l\"> K\u00f3d v\u00fdpo\u010dtu CLMUL CRC pro syst\u00e9my x86, x86-64 a E2K byl p\u0159eps\u00e1n.\n<li class=\"l\"> Na platform\u00e1ch s procesory LoongArch jsou vyu\u017e\u00edv\u00e1ny instrukce k urychlen\u00ed v\u00fdpo\u010dtu kontroln\u00edch sou\u010dt\u016f CRC32.\n<li class=\"l\"> V utilit\u011b  je zaji\u0161t\u011bno vol\u00e1n\u00ed funkce fsync() k vypr\u00e1zdn\u011bn\u00ed souborov\u00fdch cache pro v\u00fdsledn\u00fd soubor p\u0159ed odstran\u011bn\u00edm p\u016fvodn\u00edho souboru. Pro vypnut\u00ed synchronizace p\u0159ed odstran\u011bn\u00edm byla implementov\u00e1na mo\u017enost .\n<li class=\"l\"> V utilit\u00e1ch xz, xzdec a lzmainfo p\u0159i v\u00fdstupu informac\u00ed na obrazovku do\u0161lo k nahrazen\u00ed neviditeln\u00fdch znak\u016f otazn\u00edkem.\n<li class=\"l\"> V xz a xzdec na platform\u011b Linux byla pro izolaci procesu implementov\u00e1na podpora 5. a 6. verze mechanismu Landlock.\n<li class=\"l\"> Byl p\u0159id\u00e1n skript pro kontrolu licenc\u00ed build-aux\/license-check.sh.\n<li class=\"l\"> Byly vyhl\u00e1\u0161eny za zastaral\u00e9 skripty lzcmp, lzdiff, lzless, lzmore, lzgrep, lzegrep a lzfgrep, implementovan\u00e9 jako nadstavby nad utilitou xz.      <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=63017\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0430\u043a\u0435\u0442\u0430 XZ Utils 5.8.1, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0435\u0433\u043e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0443 liblzma \u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u044b \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u043e \u0441\u0436\u0430\u0442\u044b\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u043c\u0438 \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 &#171;.xz&#187;. XZ Utils 5.8.1 \u0441\u0442\u0430\u043b \u043f\u0435\u0440\u0432\u044b\u043c \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u043e\u043c \u043f\u043e\u0441\u043b\u0435 \u0438\u043d\u0446\u0438\u0434\u0435\u043d\u0442\u0430 \u0441 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u0435\u043c \u0431\u044d\u043a\u0434\u043e\u0440\u0430, \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0443\u044e\u0449\u0435\u0433\u043e \u0432\u0445\u043e\u0434 \u0447\u0435\u0440\u0435\u0437 sshd. \u041d\u0430 \u043f\u0440\u043e\u0448\u043b\u043e\u0439 \u043d\u0435\u0434\u0435\u043b\u0435 \u0432 Git \u0431\u044b\u043b \u0441\u043e\u0437\u0434\u0430\u043d \u0442\u0435\u0433 5.8.0, \u043d\u043e \u0440\u0435\u043b\u0438\u0437 \u043d\u0435 \u0431\u044b\u043b \u043e\u0431\u044a\u044f\u0432\u043b\u0435\u043d \u043e\u0444\u0438\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0438\u0437-\u0437\u0430 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u043f\u043e\u0441\u043b\u0435 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u0442\u0435\u0433\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-123408","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0430\u043a\u0435\u0442\u0430 XZ Utils 5.8.1, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0435\u0433\u043e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0443 liblzma \u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u044b \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u043e \u0441\u0436\u0430\u0442\u044b\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u043c\u0438 \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 &quot;.xz&quot;.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/cs\/blog\/news\/obnovlenie-xz-utils-5-8-1-s-ustraneniem-uyazvimosti\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 XZ Utils 5.8.1 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0430\u043a\u0435\u0442\u0430 XZ Utils 5.8.1, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0435\u0433\u043e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0443 liblzma \u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u044b \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u043e \u0441\u0436\u0430\u0442\u044b\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u043c\u0438 \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 &quot;.xz&quot;.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/cs\/blog\/news\/obnovlenie-xz-utils-5-8-1-s-ustraneniem-uyazvimosti\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2025-04-04T13:05:07+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2025-04-04T13:05:07+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Aktualizace XZ Utils 5.8.1 s odstran\u011bn\u00edm zranitelnosti | ProHoster","description":"Bylo zve\u0159ejn\u011bno vyd\u00e1n\u00ed bal\u00ed\u010dku XZ Utils 5.8.1, kter\u00e9 zahrnuje knihovnu liblzma a utility pro pr\u00e1ci se zkomprimovan\u00fdmi daty ve form\u00e1tu \".xz\".","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/obnovlenie-xz-utils-5-8-1-s-ustraneniem-uyazvimosti","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 XZ Utils 5.8.1 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 | ProHoster","og:description":"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0430\u043a\u0435\u0442\u0430 XZ Utils 5.8.1, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0435\u0433\u043e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0443 liblzma \u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u044b \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u043e \u0441\u0436\u0430\u0442\u044b\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u043c\u0438 \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 &quot;.xz&quot;.","og:url":"https:\/\/prohoster.info\/cs\/blog\/news\/obnovlenie-xz-utils-5-8-1-s-ustraneniem-uyazvimosti","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2025-04-04T13:05:07+00:00","article:modified_time":"2025-04-04T13:05:07+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"123408","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":"2026-01-23 12:02:09","breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2026-01-23 12:02:09","updated":"2026-01-23 12:02:09","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/123408","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=123408"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/123408\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=123408"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=123408"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=123408"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}